"We have a cabal in this government that literally controls our foreign policy ... Syria is a country with 3 million Christians," he said. "It was just admitted by Clinton that our government's been supporting Saudi Arabia which she admits was supporting ISIS. The lady should be getting the electric chair, being charged with treason."

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He added that Clinton knew that Saudi Arabia was supporting the Islamic State in Iraq and Syria "and she told it secretly to Goldman Sachs in her emails, but she didn't tell the public."

Duke's comments come after the debate moderator questioned him about a blog post on his website criticizing "CNN Jews."

"There is a problem in America with a very strong, powerful tribal group that dominates our media, dominates our international banking," Duke said. "I'm not opposed to all Jews."

The National Republican Senatorial Committee has denounced Duke's candidacy, stressing that he doesn't represent the party or its values.

Duke squared off against GOP candidates John Kennedy, the state's treasurer, and Reps. John Fleming and Charles Boustany Jr. Democrats were represented by Foster Campbell and Carolina Fayard at the final Louisiana Senate debate.